Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9311649248ecd4…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 02:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48674663bf4b16b4dbc652fdc28bd0a7 SHA-1: 875342264a4071a2ec2eb05148f0cd2fd70b5313 SHA-256: be9311649248ecd4478fb014bd5935349c74a8b580127917d4b8a52fcb017164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=wednesday+afternoon+wishes
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/42v07jk10ktq72j7mi5aiknhmn/65294097482.pdf
    • https://camgloberealtor.com/userfiles/file/80491874919.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a647dd8b---wenagowu.pdf
    • https://twr1115.net/files/fckeditor/file/dutuwuzoxesil.pdf
    • http://zjpjxt.cn/upload/uploadfile/file/kakexeriw.pdf
    • http://chineseclothingonline.net/File/kepig.pdf
    • http://thuduchouse.vn/pics/file/xomezipodepunudusibubu.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3638f25e---komasaxorafe.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2km5ek23mghudiccful7gikcu0/64775646337.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7dr8oal9f0gon31p4fpm18ht91/43442241745.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070572ebcd0d---15299927897.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210506215833_522154689.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/93282a4969e21b3488c40b87b1a5208c/tamorekimulazanoloje.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4e9e38e445f8e0c20c9e191ffec365cb/kupetizabururizulolo.pdf
    • http://stasta.com/userfiles/file/38745490700.pdf
    • http://morgancountyoh.com/userimages/peraloburomagubofufimusa.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b732635026---muxev.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775c0773f26---jurako.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9059913d5---vudowonavazegozikovuna.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ubghhjn1sgn6u7jhhnkdf4u0i5/refazijakanum.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49170743021.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/46a8c59eb34e95c1f26b92410956280d/surafanuvewel.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa012c58f84---rizit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b5.bin
87685669db05bbd8b3c3b53e610e229a9efff4fbfb8f4ec4fc0f500d30bfe996
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 17072 bytes
font_01_sfnt_off0001218e.bin
1990acbc25f7003da3addc9a964c4d65431d23efeda511069819c3d750f35ab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 10600 bytes
font_02_sfnt_off000139d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139D7 16792 bytes